﻿using System;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;

namespace LBSoft.Common.DotNetFile
{
    /// <summary>
    /// 文件压缩zip
    /// </summary>
    public class ZipHelper
    {
        /// <summary>
        /// 打包指定文件夹下的文件，并在指定路径创建zip文件
        /// </summary>
        /// <param name="filesPath">指定待打包的文件夹</param>
        /// <param name="zipFilePath">创建的zip文件完全路径</param>
        /// <returns>是否成功生成</returns>
        public static bool CreateZipFile(string filesPath, string zipFilePath)
        {
            bool success = false;
            if (!Directory.Exists(filesPath))
            {
                //Console.WriteLine("Cannot find directory '{0}'", filesPath);
                return false;
            }
            try
            {
                string[] filenames = Directory.GetFiles(filesPath);
                using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFilePath)))
                { 
                    s.SetLevel(9); // 压缩级别 0-9
                    //s.Password = "123"; //Zip压缩文件密码
                    byte[] buffer = new byte[4096]; //缓冲区大小
                    foreach (string file in filenames)
                    {
                        ZipEntry entry = new ZipEntry(Path.GetFileName(file));
                        entry.DateTime = DateTime.Now;
                        s.PutNextEntry(entry);
                        using (FileStream fs = File.OpenRead(file))
                        {
                            int sourceBytes;
                            do
                            {
                                sourceBytes = fs.Read(buffer, 0, buffer.Length);
                                s.Write(buffer, 0, sourceBytes);
                            } while (sourceBytes > 0);
                        }
                    }
                    success = true;
                    s.Finish();
                    s.Close();

                    if (Directory.Exists(filesPath))
                    {
                        Directory.Delete(filesPath, true);
                    }
                }
            }
            catch (Exception ex)
            {
                success = false;
                //Console.WriteLine("Exception during processing {0}", ex);
            }
            finally
            {

            }
            return success;
        }
        /// <summary>
        /// 解压zip文件
        /// </summary>
        /// <param name="zipFilePath">zip文件路径</param>
        public static void UnZipFile(string zipFilePath)
        {
            if (!File.Exists(zipFilePath))
            {
                //Console.WriteLine("Cannot find file '{0}'", zipFilePath);
                return;
            }

            using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipFilePath)))
            { 
                ZipEntry theEntry;
                while ((theEntry = s.GetNextEntry()) != null)
                {  
                    string directoryName = Path.GetDirectoryName(theEntry.Name);
                    string fileName = Path.GetFileName(theEntry.Name);

                    // create directory
                    if (directoryName.Length > 0)
                    {
                        Directory.CreateDirectory(directoryName);
                    }

                    if (fileName != String.Empty)
                    {
                        using (FileStream streamWriter = File.Create(theEntry.Name))
                        { 
                            int size = 2048;
                            byte[] data = new byte[2048];
                            while (true)
                            {
                                size = s.Read(data, 0, data.Length);
                                if (size > 0)
                                {
                                    streamWriter.Write(data, 0, size);
                                }
                                else
                                {
                                    break;
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}
